/***********************************************************************
 * BinTrotter : BitTorrent library/client for the Android operating system.
 *  
 * Copyright (C) 2009, Christopher David Stones (chris.stones@gmail.com)
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 ***********************************************************************/

package org.bintrotter.apeer.receivestates;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;

import org.bintrotter.apeer.Peer;

public class MessageId implements ReceiveState {

	private Peer m_peer;
	private SocketChannel   sc;
	private ByteBuffer		bb;
	private byte[] msgId;
	
	public MessageId(Peer peer) {
		
		m_peer = peer;
		msgId = new byte[] {0};
		bb = null;
	}
	
	@Override
	public void reset() {

		
		msgId[0] = 0;
		if(bb==null)
			bb = ByteBuffer.wrap(msgId);
		else
			bb.rewind();
		
		sc = m_peer.channel();
	}

	@Override
	public States update() {
		
		try
		{
			sc.read(bb);
			
			if(bb.hasRemaining()==false) {
		
					switch(msgId[0]) {
				
					case 0: return States.CHOKE;
					case 1: return States.UNCHOKE;
					case 2: return States.INTERESTED;
					case 3: return States.NOT_INTERESTED;
					case 4: return States.HAVE;
					case 5: return States.BITFIELD;
					case 6: return States.REQUEST;
					case 7: return States.PIECE_INDEX;
					case 8: return States.CANCEL;
					case 9: return States.PORT;
					}
			}
			return States.MSG_ID;
		}
		catch(IOException ioe) {
		
			return States.SHUTDOWN;
		}
	}

}
